Bài 5 :

a) \(\dfrac{2}{5}+\dfrac{3}{4}:x=-\dfrac{1}{2}\)

\(\dfrac{3}{4}:x=-\dfrac{1}{2}-\dfrac{2}{5}\)

\(\dfrac{3}{4}:x=-\dfrac{9}{10}\)

\(x=\dfrac{3}{4}:-\dfrac{9}{10}\)

\(x=-\dfrac{5}{6}\)

b)\(x:\dfrac{46}{95}=\dfrac{20}{33}\)

\(x=\dfrac{20}{23}.\dfrac{46}{95}\)

x = 8/19

c)\(-\dfrac{85}{33}:x=\dfrac{25}{-11}\)

\(x=-\dfrac{85}{33}:\dfrac{25}{-11}\)

\(x=\dfrac{17}{15}\)

Zzz 💢